/*
 * Copyright (c) 2011. c.mueller
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * The Software shall be used for Good, not Evil.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package de.altitude.cimuelle.db;

import de.altitude.cimuelle.Config;
import org.apache.log4j.Logger;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;


class DatabaseConnectionCreator {
    private static final Logger LOGGER = Logger.getLogger("DatabaseConnectionCreator");

    private transient Connection con;
    private transient boolean conEstablished = false;
    private transient boolean reconnectTry = false;

    public DatabaseConnectionCreator() {
        connect();
    }

    private void connect() {
        try {
            final Config config = Config.getInstance();
            final String host = config.getConfig("mysql.host", "localhost") + ":" + config.getConfig("mysql.port", "3306");
            final String database = config.getConfig("mysql.database");
            final Properties databaseCon = new Properties();
            databaseCon.setProperty("user", config.getConfig("mysql.user"));
            databaseCon.setProperty("password", config.getConfig("mysql.password"));
            final String connection = "jdbc:mysql://" + host + "/" + database + "?autoReconnect=true&zeroDateTimeBehavior=convertToNull";
            con = DriverManager.getConnection(connection, databaseCon);
            conEstablished = true;
        } catch (SQLException ex) {
            // Fehler behandeln
            LOGGER.error("SQLException: " + ex.getMessage());
            LOGGER.error("SQLState: " + ex.getSQLState());
            LOGGER.error("VendorError: " + ex.getErrorCode());
            LOGGER.error(ex);
            conEstablished = false;
        }
    }

    public Connection getCon() {
        if (conEstablished) {
            reconnectTry = false;
            return con;
        } else {
            LOGGER.error("SQL Connection not available, trying to reconnect.");
            connect();
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                LOGGER.error(e, e);
            }
            if (!reconnectTry) {
                reconnectTry = true;
                return getCon();
            }
        }
        return null;
    }
}
